Create GPUMetricsProvider.

chrome/browser/metrics/gpu_metrics_provider.h

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_BROWSER_METRICS_GPU_METRICS_PROVIDER_H_
+#define CHROME_BROWSER_METRICS_GPU_METRICS_PROVIDER_H_
+
+#include "base/basictypes.h"
+#include "components/metrics/metrics_data_provider.h"
+#include "ui/gfx/size.h"
+
+// GPUMetricsProvider provides GPU-related metrics.
+class GPUMetricsProvider : public metrics::MetricsDataProvider {
+ public:
+  GPUMetricsProvider();
+  virtual ~GPUMetricsProvider();
+
+  // metrics::MetricsDataProvider:
+  virtual void ProvideSystemProfileMetrics(
+      metrics::SystemProfileProto* system_profile_proto) OVERRIDE;
+
+ protected:
+  // Exposed for the sake of mocking in test code.
+
+  // Returns the screen size for the primary monitor.
+  virtual gfx::Size GetScreenSize() const;
+
+  // Returns the device scale factor for the primary monitor.
+  virtual float GetScreenDeviceScaleFactor() const;
+
+  // Returns the number of monitors the user is using.
+  virtual int GetScreenCount() const;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(GPUMetricsProvider);
+};
+
+#endif  // CHROME_BROWSER_METRICS_GPU_METRICS_PROVIDER_H_